It’s only pulling a P0135 code for bank 1 sensor 1 but I need to drive it more which I will once I get the rest of the exhaust.That does take a little too long, but with open headers your oxygen sensor data is being screwed up, and you may need a tune to correct how quickly the oxygen sensors respond now because they are further down stream. Get some exhaust on it and drive it a little and see what it does.
Somehow after getting the AC system up and running I have had idle issues since LolThrowing an IAC on there is easy enough. Just a heads up though, the aftermarket valves don’t work very well. They are really hit and miss. Motorcraft is your best bet, but they are more expensive